- Viable count (CFU/g)
- Plate count on an enterococci medium such as Slanetz-Bartley or bile esculin azide agar, reported per gram against a minimum.
- Identity
- Strain identity by whole-genome sequencing, which also separates E. faecium from E. lactis.
- Antibiotic susceptibility
- Minimum inhibitory concentrations for ampicillin, vancomycin and other antibiotics, plus genome screening for acquired resistance and virulence genes.
- Contaminant microbiology
- Enterobacteriaceae, E. coli, Staphylococcus aureus, yeast and mold, and absence of Salmonella and Listeria monocytogenes.
- Heavy metals
- Lead, arsenic, cadmium and mercury by ICP-MS against the supplier's specification.